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1 | // inremental.cc -- incremental linking support for gold |
2 | ||
3 | // Copyright 2009 Free Software Foundation, Inc. | |
4 | // Written by Mikolaj Zalewski <mikolajz@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | #include "elfcpp.h" | |
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25 | #include "output.h" |
26 | #include "incremental.h" | |
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27 | |
28 | using elfcpp::Convert; | |
29 | ||
30 | namespace gold { | |
31 | ||
32 | // Version information. Will change frequently during the development, later | |
33 | // we could think about backward (and forward?) compatibility. | |
34 | const int INCREMENTAL_LINK_VERSION = 1; | |
35 | ||
36 | namespace internal { | |
37 | ||
38 | // Header of the .gnu_incremental_input section. | |
3ce2c28e | 39 | struct Incremental_inputs_header_data |
0e879927 ILT |
40 | { |
41 | // Incremental linker version. | |
42 | elfcpp::Elf_Word version; | |
43 | ||
44 | // Numer of input files in the link. | |
45 | elfcpp::Elf_Word input_file_count; | |
46 | ||
47 | // Offset of command line options in .gnu_incremental_strtab. | |
48 | elfcpp::Elf_Word command_line_offset; | |
49 | ||
50 | // Padding. | |
51 | elfcpp::Elf_Word reserved; | |
52 | }; | |
53 | ||
54 | // Data stored in .gnu_incremental_input after the header for each of the | |
55 | // Incremental_input_header_data::input_file_count input entries. | |
3ce2c28e | 56 | struct Incremental_inputs_entry_data |
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57 | { |
58 | // Offset of file name in .gnu_incremental_strtab section. | |
59 | elfcpp::Elf_Word filename_offset; | |
60 | ||
61 | // Offset of data in .gnu_incremental_input. | |
62 | elfcpp::Elf_Word data_offset; | |
63 | ||
64 | // Timestamp (in seconds). | |
65 | elfcpp::Elf_Xword timestamp_sec; | |
66 | ||
67 | // Nano-second part of timestamp (if supported). | |
68 | elfcpp::Elf_Word timestamp_usec; | |
69 | ||
70 | // Type of the input entry. | |
71 | elfcpp::Elf_Half input_type; | |
72 | ||
73 | // Padding. | |
74 | elfcpp::Elf_Half reserved; | |
75 | }; | |
76 | ||
77 | } | |
78 | ||
79 | // Accessors. | |
80 | ||
81 | // See internal::Incremental_input_header for fields descriptions. | |
82 | template<int size, bool big_endian> | |
3ce2c28e | 83 | class Incremental_inputs_header_write |
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84 | { |
85 | public: | |
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86 | Incremental_inputs_header_write(unsigned char *p) |
87 | : p_(reinterpret_cast<internal::Incremental_inputs_header_data*>(p)) | |
0e879927 | 88 | { } |
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89 | |
90 | static const int data_size = sizeof(internal::Incremental_inputs_header_data); | |
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91 | |
92 | void | |
93 | put_version(elfcpp::Elf_Word v) | |
94 | { this->p_->version = Convert<32, big_endian>::convert_host(v); } | |
95 | ||
96 | void | |
3ce2c28e | 97 | put_input_file_count(elfcpp::Elf_Word v) |
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98 | { this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); } |
99 | ||
100 | void | |
3ce2c28e | 101 | put_command_line_offset(elfcpp::Elf_Word v) |
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102 | { this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); } |
103 | ||
104 | void | |
3ce2c28e | 105 | put_reserved(elfcpp::Elf_Word v) |
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106 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } |
107 | ||
108 | private: | |
3ce2c28e | 109 | internal::Incremental_inputs_header_data* p_; |
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110 | }; |
111 | ||
112 | // See internal::Incremental_input_entry for fields descriptions. | |
113 | template<int size, bool big_endian> | |
3ce2c28e | 114 | class Incremental_inputs_entry_write |
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115 | { |
116 | public: | |
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117 | Incremental_inputs_entry_write(unsigned char *p) |
118 | : p_(reinterpret_cast<internal::Incremental_inputs_entry_data*>(p)) | |
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119 | { } |
120 | ||
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121 | static const int data_size = sizeof(internal::Incremental_inputs_entry_data); |
122 | ||
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123 | void |
124 | put_filename_offset(elfcpp::Elf_Word v) | |
125 | { this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); } | |
126 | ||
127 | void | |
128 | put_data_offset(elfcpp::Elf_Word v) | |
129 | { this->p_->data_offset = Convert<32, big_endian>::convert_host(v); } | |
130 | ||
131 | void | |
132 | put_timestamp_sec(elfcpp::Elf_Word v) | |
133 | { this->p_->timestamp_sec = Convert<32, big_endian>::convert_host(v); } | |
134 | ||
135 | void | |
136 | put_timestamp_usec(elfcpp::Elf_Word v) | |
137 | { this->p_->timestamp_usec = Convert<32, big_endian>::convert_host(v); } | |
138 | ||
139 | void | |
140 | put_input_type(elfcpp::Elf_Word v) | |
141 | { this->p_->input_type = Convert<32, big_endian>::convert_host(v); } | |
142 | ||
143 | void | |
144 | put_reserved(elfcpp::Elf_Word v) | |
145 | { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } | |
146 | ||
147 | private: | |
3ce2c28e | 148 | internal::Incremental_inputs_entry_data* p_; |
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149 | }; |
150 | ||
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151 | // Add the command line to the string table, setting |
152 | // command_line_key_. In incremental builds, the command line is | |
153 | // stored in .gnu_incremental_inputs so that the next linker run can | |
154 | // check if the command line options didn't change. | |
155 | ||
156 | void | |
157 | Incremental_inputs::report_command_line(int argc, const char* const* argv) | |
158 | { | |
159 | // Always store 'gold' as argv[0] to avoid a full relink if the user used a | |
160 | // different path to the linker. | |
161 | std::string args("gold"); | |
162 | // Copied from collect_argv in main.cc. | |
163 | for (int i = 1; i < argc; ++i) | |
164 | { | |
165 | args.append(" '"); | |
166 | // Now append argv[i], but with all single-quotes escaped | |
167 | const char* argpos = argv[i]; | |
168 | while (1) | |
169 | { | |
170 | const int len = strcspn(argpos, "'"); | |
171 | args.append(argpos, len); | |
172 | if (argpos[len] == '\0') | |
173 | break; | |
174 | args.append("'\"'\"'"); | |
175 | argpos += len + 1; | |
176 | } | |
177 | args.append("'"); | |
178 | } | |
179 | this->strtab_->add(args.c_str(), true, &this->command_line_key_); | |
180 | } | |
181 | ||
182 | // Finalize the incremental link information. Called from | |
183 | // Layout::finalize. | |
184 | ||
185 | void | |
186 | Incremental_inputs::finalize() | |
187 | { | |
188 | this->strtab_->set_string_offsets(); | |
189 | } | |
190 | ||
191 | // Create the content of the .gnu_incremental_inputs section. | |
192 | ||
193 | Output_section_data* | |
194 | Incremental_inputs::create_incremental_inputs_section_data() | |
195 | { | |
196 | switch (parameters->size_and_endianness()) | |
197 | { | |
198 | #ifdef HAVE_TARGET_32_LITTLE | |
199 | case Parameters::TARGET_32_LITTLE: | |
200 | return this->sized_create_inputs_section_data<32, false>(); | |
201 | #endif | |
202 | #ifdef HAVE_TARGET_32_BIG | |
203 | case Parameters::TARGET_32_BIG: | |
204 | return this->sized_create_inputs_section_data<32, true>(); | |
205 | #endif | |
206 | #ifdef HAVE_TARGET_64_LITTLE | |
207 | case Parameters::TARGET_64_LITTLE: | |
208 | return this->sized_create_inputs_section_data<64, false>(); | |
209 | #endif | |
210 | #ifdef HAVE_TARGET_64_BIG | |
211 | case Parameters::TARGET_64_BIG: | |
212 | return this->sized_create_inputs_section_data<64, true>(); | |
213 | #endif | |
214 | default: | |
215 | gold_unreachable(); | |
216 | } | |
217 | } | |
218 | ||
219 | // Sized creation of .gnu_incremental_inputs section. | |
220 | ||
221 | template<int size, bool big_endian> | |
222 | Output_section_data* | |
223 | Incremental_inputs::sized_create_inputs_section_data() | |
224 | { | |
225 | unsigned int sz = | |
226 | Incremental_inputs_header_write<size, big_endian>::data_size; | |
227 | unsigned char* buffer = new unsigned char[sz]; | |
228 | Incremental_inputs_header_write<size, big_endian> header_writer(buffer); | |
229 | ||
230 | gold_assert(this->command_line_key_ > 0); | |
231 | int cmd_offset = this->strtab_->get_offset_from_key(this->command_line_key_); | |
232 | ||
233 | header_writer.put_version(INCREMENTAL_LINK_VERSION); | |
234 | header_writer.put_input_file_count(0); // TODO: store input files data. | |
235 | header_writer.put_command_line_offset(cmd_offset); | |
236 | header_writer.put_reserved(0); | |
237 | ||
238 | return new Output_data_const_buffer(buffer, sz, 8, | |
239 | "** incremental link inputs list"); | |
240 | } | |
241 | ||
0e879927 | 242 | } // End namespace gold. |